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