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