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