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