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