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