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