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