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I think I read somewhere that Genestealers naturally revert to purple when they are away from the hive fleet, does this mean that the cult would also be the same purple or would they be the colour of the hive fleet whose arrival they are preparing for ?

Do whatever works for your dudes.

I know I can but I like my armies to be fluffy where possible and I’m kinda just interested to.

And would their skin reverse to hive fleet color once it get closes to the planet ?

Fluff-wise, the artwork and novels show/describe cultists with a deep blue carapace that matches the purestrain genestealers, and I haven't heard anything about the skin color changing — just that the 1st/2nd-generation hybrids begin developing tyranid biomorphs (crushing claws/scything talons/whip-lashes/etc) as the hive fleet closes in on the star system.