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