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