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