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