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