How can I become friends with women without making it seem like I’m interested in dating them?

I’m a bisexual guy and I like having both male and female friends. There’s a girl in my college seminar that seems super cool, and she seems like exactly the kind of person I’d want to be friends with, but because of our assigned seating I never have an excuse to talk to her. I have no interest in asking her out (and I think she might be a lesbian given the stickers she has on her laptop), but if I just randomly approach her after class and try to talk to her for no reason it’s probably going to look like I’m hitting on her when that’s not the case at all?
How can I become friends with women without making it seem like I’m interested in dating them?
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