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