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