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