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