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)(11,13)(12,14)(15,16)(17,18)(19,28)(20,31)(21,27)(22,24)(23,29)(25,30)(26,32) involution — undirected(2,6)(7,8)(9,11)(10,13)(12,15)(14,16)(17,19,22,29)(18,23,24,28)(20,32,30,21)(25,26,31,27)(1,3,5,4)(2,7,6,8)(10,14)(11,15)(18,24)(19,29)(20,30)(26,27)(1,4,5,3)(2,8,6,7)(10,14)(13,16)(17,20,21,19,22,30,32,29)(18,25,27,23,24,31,26,28)(2,6)(7,8)(17,21,22,32)(18,26,24,27)(19,20,29,30)(23,31,28,25)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.