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