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