I doubt you'll find anything other than B&W pictures, so you can probably just pull the colors out of your a....I mean, make an educated guess.
I've got a couple of the Island Airlines kits in the basement. "Someday" I plan to build one with a scratchbuilt interior, aftermarket engines, the works..as it appeared the day I flew in it. Of course the old Monogram kit is actually 1/76-ish scale. It's also the earlier, shorter 4-AT, while the Airfix kit is the later, longer 5-AT (and 1/72 scale.) In my dreams, Tamiya would release a new-tool 1/72 4-AT and 5-AT. I'm not holding my breath, though....
SN