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