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