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