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