In your OPTIONS > MISC you should have two options:
"AI uses Player setup"
"AI uses Player colours"
or something similar to that....
Set those to yes. Now if you want them to have your setup, you need to go into YOUR garage first, get the setup you want, and in the pre-race screen where you add AI, you click to add them. They should have your setup.
If you want the AI to have your same colors, adding them will just copy your colors and it is that easy. If you want the AI to have different skins/colors.... just goto the car that they will be driving and create color profiles that have the SAME name as the AI. So if I had "AI-BOB" in the FXO, I would make a color profile for the FXO called AI-BOB. So whenever you add AI-BOB, his custom color settings will be applied.