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