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