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