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