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