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