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