One vertex per element, one color per generator, with an edge from x to x·s.
(5,6)(7,8)(10,13)(14,16)(17,18)(19,27)(20,23)(21,25)(22,31)(24,29)(26,30)(28,32) involution — undirected(1,2)(3,4)(9,10,12,13)(11,14,15,16)(17,19)(18,23)(20,21)(22,28)(24,31)(25,27)(26,32)(29,30)(2,4)(9,11)(10,14)(12,15)(13,16)(17,20,21,19)(18,24,25,32)(22,28,30,29)(23,26,27,31)(6,8)(11,15)(14,16)(19,20)(23,27)(24,32)(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.