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