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