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