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