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