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