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