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)(27,35)(28,37)(29,34)(30,31)(32,36)(33,38)(39,40)(1,2,5,6)(3,4,7,8)(11,12)(14,22)(16,18)(17,21)(26,31)(28,38)(32,35)(34,40)(2,6)(3,7)(9,11,15,12)(10,16,13,18)(14,19,22,20)(17,23,21,24)(25,27,30,36)(26,32,31,35)(28,34,38,40)(29,37,39,33)(2,6)(3,7)(9,12,15,11)(10,16,13,18)(14,20,22,19)(17,23,21,24)(25,28)(26,33)(27,34)(29,32)(30,38)(31,37)(35,39)(36,40)(1,3)(2,4)(5,7)(6,8)(9,13,15,10)(11,16,12,18)(14,21,22,17)(19,23,20,24)(25,29)(26,34)(27,33)(28,32)(30,39)(31,40)(35,38)(36,37)(1,4)(2,3)(5,8)(6,7)(9,14,15,22)(10,17,13,21)(11,19,12,20)(16,23,18,24)(25,28)(26,33)(27,34)(29,32)(30,38)(31,37)(35,39)(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.