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)(17,18,23,24,22,26,21,20)(19,25,29,28,27,32,30,31)(9,10)(11,15)(12,14)(13,16)(18,24)(19,27)(20,26)(21,23)(25,31)(28,32) involution — undirected(1,3,5,4)(2,6,7,8)(9,11,12,16)(10,13,14,15)(17,19)(18,25)(20,31)(21,30)(22,27)(23,29)(24,28)(26,32)(11,16)(13,15)(17,20,23,18,22,24,21,26)(19,28,29,32,27,31,30,25)(1,4,5,3)(2,6,7,8)(10,14)(13,15)(17,21,22,23)(18,20,26,24)(19,29,27,30)(25,28,32,31)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.