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