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