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