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