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)(11,14)(12,15)(13,16)(17,21)(18,22)(19,23)(20,24)(25,26,30,28)(27,33,36,40)(29,37,38,32)(31,39,34,35)(9,11)(10,14)(12,19)(13,17)(15,23)(16,21)(18,20)(22,24)(25,27,29,35,30,36,38,39)(26,31,32,33,28,34,37,40)(2,5)(6,8)(11,17)(14,21)(18,19)(22,23)(25,26,30,28)(27,34,36,31)(29,32,38,37)(33,35,40,39)(9,12,13,20)(10,15,16,24)(11,18,17,19)(14,22,21,23)(25,28,30,26)(27,31,36,34)(29,37,38,32)(33,39,40,35)(1,3,4,7)(2,6,5,8)(10,16)(14,21)(15,24)(22,23)(26,28)(31,34)(32,37)(33,40)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.