The Minecraft wiki suggests this:
...with this being the key to the diagram.
The way I read it, the set and reset wires run into two blocks. On the opposite side, put a torch on the set side, then run a wire back to the block opposite reset. Above this wire lies another block where a new wire starts and leads to the output.
Obviously this has to be the wrong way to read the diagram, as the reset and output wires are connected to anything.
How can I make a S/R latch with adjacent inputs?