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