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