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