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