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