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