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