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