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