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