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