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