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