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