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