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