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