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