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