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