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