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