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