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