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