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