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