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