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