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