One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,8)(5,6)(9,10)(11,15)(12,14)(13,16)(19,25)(23,31)(26,27)(28,32) involution — undirected(9,11)(10,13)(12,16)(14,15)(17,18,21,24)(19,26,25,27)(20,22,29,30)(23,32,31,28)(2,6)(7,8)(10,14)(11,16)(17,19,22,28,21,25,30,32)(18,23,20,26,24,31,29,27)(1,3,5,4)(2,7,6,8)(10,14)(13,15)(19,25)(23,31)(26,27)(28,32)(1,4,5,3)(2,8,6,7)(17,20,22,24,21,29,30,18)(19,27,28,23,25,26,32,31)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.