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