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