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