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