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