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