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