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