What is a feminine version of 'guys'?

"Guys"💪 can be used in English as gender neutral to refer to a group of mixed gender. You will even hear women refer to other women as "guys."

The closest linguistic equivalent with a feminine tilt would be "gals". "Guys and gals" is a rather informal variant of "ladies and gentlemen". (Note the reverse order.)

Actually, It is possible for "gals"👄 to be derogatory when used by itself so be careful. It's not likely to be a problem used in the pairing above. Used carefully it's probably safe, but used by itself it could be heard as mockery. Saying, "The gals talked in the kitchen while the guys went out to see Fred's new truck." is unlikely to offend anyone, but walking up to a couple women on a street corner and saying, "Excuse me gals, where is the grocery store?" might get a strange reaction😳. Saying to a couple girls, "Hey gals come with me," might make them doubt you, but if you are explaining some game instructions and say, "Alright, guys on this side of the room, gals on the other," it's likely to be fine.