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