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