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Cults have always been black IME (though I haven't seen them often and my most vivid memory of them is in Brightest Day where they were literally "Black Lantern Corps" so that may be a part of why I associate them with black).
I don't think most of the other factions have a standard colour (nor do I really think they need one) and I think it's generally up to individual mods (though the same could be said for the regular factions as well).
Re: that last line, put them into slots maybe. Highest priority slot (e.g. Serial Killer) gets standard purple, go down a list until you get to the last one (even if it's ultimately just different distinct shades of purple)?
EDIT: In case this wasn't clear, if you're not worried about revealing the fact that there's a certain amount of third parties in the game, if there are multiples, just give the serial killer dark purple, the jester light purple, some other anti-town third party a shade of pink, etc. But if it's a jester with no serial killer, give it dark purple because it's the highest priority.
Or just standardise it like that and have purple(ish) colours represent anti-town singular third parties and give them the same distinct shades every game.