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