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