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