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