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