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)(11,16)(12,14)(13,15)(17,18,22,26)(19,25,20,24)(21,27,30,32)(23,28,29,31)(1,3,4,8)(2,5,6,7)(17,19,22,20)(18,24,26,25)(21,23,30,29)(27,31,32,28)(9,11,13,12)(10,14,15,16)(17,20,23,30,22,19,29,21)(18,25,28,27,26,24,31,32)(2,6)(5,7)(18,26)(24,25)(27,32)(28,31) involution — undirected(3,8)(5,7)(9,12,13,11)(10,14,15,16)(17,21,29,19,22,30,23,20)(18,27,31,25,26,32,28,24)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.