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)(17,18,22,30,21,26,20,25)(19,24,27,23,29,31,28,32)(9,11)(10,13)(12,15)(14,16)(17,19)(18,23)(20,27)(21,29)(22,28)(24,30)(25,31)(26,32) involution — undirected(2,5)(6,8)(10,14)(11,15) involution — undirected(1,3,4,7)(2,6,5,8)(11,15)(13,16)(17,19)(18,24)(20,28)(21,29)(22,27)(23,30)(25,32)(26,31)(17,20,21,22)(18,25,26,30)(19,27,29,28)(23,31,32,24)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.