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