Logic gate diagram for JK latch? (Not flip-flop)
This is pretty easy to derive by hand. A JK latch is just like an SR latch except with a 11 input, an SR latch does nothing, while a JK latch toggles. So, basically, you can write out the truth table and solve it with a Karnaugh map.

The lack of a clock makes toggling pretty useless here; I have never seen a JK latch in the wild but they are theoretically quite possible.