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