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