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