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