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