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