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