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