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)(11,12)(13,14)(15,16)(19,22)(20,24)(27,31)(29,32) involution — undirected(2,7)(5,8)(9,11,14,16)(10,15,13,12)(17,18,21,23)(19,20,22,24)(25,26,28,30)(27,29,31,32)(1,3,6,4)(2,8,7,5)(9,12)(10,16)(11,13)(14,15)(17,19,21,22)(18,20,23,24)(25,27)(26,29)(28,31)(30,32)(1,4,6,3)(2,8,7,5)(9,12)(10,11)(13,16)(14,15)(25,27)(26,29)(28,31)(30,32)(1,5,6,8)(2,4,7,3)(9,13,14,10)(11,15,16,12)(17,20)(18,22)(19,23)(21,24)(25,27)(26,29)(28,31)(30,32)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.