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