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