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