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