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