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