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)(11,15,16,13)(17,18,23,21)(19,27,28,24)(20,25,30,31)(22,26,29,32)(9,11,12,16)(10,13,14,15)(17,19)(18,24)(20,29)(21,27)(22,30)(23,28)(25,26)(31,32)(1,3,5,8)(2,6,7,4)(19,28)(22,29)(24,27)(26,32)(1,3)(2,4)(5,8)(6,7)(17,20)(18,25)(19,29)(21,31)(22,28)(23,30)(24,26)(27,32) involution — undirected(1,4)(2,3)(5,6)(7,8)(17,21,23,18)(19,27,28,24)(20,25,30,31)(22,32,29,26)(17,22,23,29)(18,26,21,32)(19,20,28,30)(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.