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