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