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