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