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