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