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