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