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