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