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