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)(27,31)(28,30)(29,32) involution — undirected(2,6)(7,8)(9,10,12,13)(11,14,15,16)(17,19,22,29)(18,23,26,32)(20,27,21,28)(24,30,25,31)(1,3,5,4)(2,7,6,8)(10,13)(11,15)(18,24)(20,21)(23,30)(25,26)(27,28)(31,32)(1,4,5,3)(2,8,6,7)(9,11)(10,14)(12,15)(13,16)(10,13)(11,15)(17,20,22,21)(18,25,26,24)(19,27,29,28)(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.