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