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