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