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