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