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