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