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