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