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