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