One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,8)(3,7,4,6)(9,10,15,18,14,19,13,23)(11,20,21,17,12,16,22,24)(25,26,28,32,30,34,29,33)(27,31,37,40,35,39,36,38)(1,3,5,4)(2,6,8,7)(9,11,13,22,14,12,15,21)(10,16,23,17,19,20,18,24)(25,27,28,37,30,35,29,36)(26,31,32,40,34,39,33,38)(9,12,14,11)(10,17,19,24)(13,22,15,21)(16,18,20,23)(26,32)(27,35)(28,29)(31,38)(33,34)(39,40)(1,4,5,3)(2,7,8,6)(9,13,14,15)(10,18,19,23)(11,21,12,22)(16,17,20,24)(25,28,30,29)(26,32,34,33)(27,36,35,37)(31,38,39,40)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.