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