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