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