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