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