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