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