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