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