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