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