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