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