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