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