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