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