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