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)(27,34)(28,31)(29,32)(30,33)(35,37)(36,39)(38,40)(1,2,6,5)(3,8,7,4)(9,11)(10,15)(12,18)(13,17)(14,19)(16,23)(20,22)(21,24)(25,27)(26,28)(29,35)(30,31)(32,36)(33,34)(37,40)(38,39)(1,3)(2,4)(5,8)(6,7)(9,11,14,19)(10,15,17,13)(12,20,22,18)(16,21,24,23)(25,28,30,34)(26,31,33,27)(29,37,38,36)(32,35,40,39)(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)(26,27)(29,37)(30,34)(31,33)(32,39)(35,40)(36,38)(1,4,6,8)(2,7,5,3)(9,12)(10,16)(11,18)(13,21)(14,22)(15,23)(17,24)(19,20)(25,29,30,38)(26,32,33,40)(27,35,31,39)(28,36,34,37)(1,5,6,2)(3,8,7,4)(9,13,14,15)(10,11,17,19)(12,21,22,23)(16,18,24,20)(25,26)(27,28)(29,32)(30,33)(31,34)(35,36)(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.