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