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)(17,18,21,26,22,27,20,25)(19,24,28,31,29,32,30,23)(9,11)(10,13)(12,15)(14,16)(17,19)(18,23)(20,28)(21,30)(22,29)(24,25)(26,32)(27,31) 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)(20,30)(21,28)(22,29)(23,25)(26,31)(27,32)(17,20,22,21)(18,25,27,26)(19,28,29,30)(23,24,31,32)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.