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