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