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