Yes that sort of device would more likely use known wire colors for specific uses…
BUT they will change wire colors with subsequent model years. Just like the computer industry, every 3 years everything changes! So you would need to know the specific model/manufacturer.
Also for security related wiring, manufacturers will intentionally use confusing wire color combinations. In some cases, they use ALL THE SAME COLOR wiring!
This is done with alarm systems. Also they will run, say 3 wires, all the same color to 3 connections on a door contact. If you “short” any combination of wires, the alarm will trip. If you “cut” any wire, the alarm will trip. And doing so even when the alarm is turned off will give a “tamper” notification. (High security applications.)
A few thoughts from someone who is not a bomb tech, but who knows a few:
Bombs are very dangerous. Amateur bomb makers probably don’t have very long careers due to the high cost of careless mistakes.
Professional bomb makers presumably get trained in their craft, either by a state-sponsored agency (military advisers, intelligence agents, or even just attending a school for bomb-making), and a side effect of this is that anyone trained by a particular school will tend to put their bombs together the same proven way. This might include color-coded wiring for the reasons mentioned above, namely that they minimize the chance of wiring errors that could cause the bomb to go off prematurely or not at all.
More than a few bombs in real life are modified versions of professionally-manufactured military munitions (aerial bombs, artillery shells, etc.). The munitions themselves are certainly produced in a consistent pattern due to being the products of industrial mass production, even if the after-market detonators might be all over the place.
Even if a bomb doesn’t go off, it’s known presence can be a severe disruption in public areas, important roads, or targeted facilities. If you include a few booby traps in the bomb design, you can cause this disruption to last longer while the bomb squad guys work around the booby traps (assuming they know about them), which leads to…
Bomb squad technicians require a rather high amount of training, and thus are themselves fairly high-value targets in any area where the use of concealed bombs is an ongoing tactic. Further, if you are kind of an asshole, first responders and repair crews can also be considered priority targets due to the disruption in recovery/repair efforts. For example, one tactic occasionally used in aerial bombing is to have some of the bombs dropped by the plane fused to go off several hours later, to mess with the bomb squads and repair crews trying to fix the damage from the raid.