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