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