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