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