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)(19,25)(20,28)(21,24)(22,26)(23,29)(27,30)(31,32) involution — undirected(1,3,5,4)(2,6,7,8)(9,11)(10,13)(12,15)(14,16)(19,26)(20,27)(22,25)(23,31)(28,30)(29,32)(10,14)(11,15)(17,19,21,26)(18,22,24,25)(20,27,29,32)(23,30,28,31)(1,4,5,3)(2,6,7,8)(10,14)(13,16)(17,20,26,32,21,29,19,27)(18,23,22,30,24,28,25,31)(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.