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