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