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