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