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