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