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