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