One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(11,15)(14,16)(17,18,24,28)(19,29,20,32)(21,26,25,31)(22,27,23,30)(2,5)(6,8)(9,10)(11,14)(12,13)(15,16)(17,19,23,26,24,20,22,31)(18,25,27,29,28,21,30,32)(1,3,4,7)(2,6,5,8)(10,13)(14,16)(17,20,23,31,24,19,22,26)(18,21,27,32,28,25,30,29)(10,13)(14,16)(17,21)(18,26)(19,30)(20,27)(22,29)(23,32)(24,25)(28,31) involution — undirected(9,11,12,15)(10,14,13,16)(17,22,24,23)(18,27,28,30)(19,31,20,26)(21,32,25,29)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.