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