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