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