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