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