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