spark up a conversation and mention that you should get together sometime outside of work and hang out it will be fun.
or you could say something like we should stay in touch, perhaps we could get together and do something sometime afterwork. while you say this either hand her your cell phone or pen and paper,
if you hand her your cell phone just say, hook a crook up with yo digits (a personal fav). or whatever you choose to say
or
if you do the pen and paper thing make sure that the paper you use is something that looks like scratch paper, you dont wanna pull out a nicely cut little piece of paper cause that would seem rehearsed.
i personally carry a small sharpie mini and an old reciept from somewhere for this exact purpose.
this is just my opinion take it or leave it
good luck
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