One vertex per element, one color per generator, with an edge from x to x·s.
(5,6)(7,8)(9,10)(11,14)(12,16)(13,15)(17,18)(19,25)(20,30)(21,23)(22,28)(24,26)(27,31)(29,32) involution — undirected(1,2)(3,4)(9,11,13,12)(10,14,15,16)(17,19,26,27,21,29,20,28)(18,22,30,32,23,31,24,25)(2,4)(9,12,13,11)(10,14,15,16)(18,23)(22,31)(24,30)(25,32)(6,8)(19,27)(20,26)(22,32)(24,30)(25,31)(28,29) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.