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