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