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