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