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