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