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