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