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