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