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