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