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