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