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