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