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