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