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)(25,26,31,33)(27,34,30,32)(28,29,38,40)(35,36,37,39)(1,3,5,8)(2,6,4,7)(9,10,14,12)(11,15,19,17)(13,16,21,20)(18,22,24,23)(25,27,31,30)(26,32,33,34)(28,37,38,35)(29,36,40,39)(9,10,14,12)(11,17,19,15)(13,16,21,20)(18,23,24,22)(25,28)(26,29)(27,35)(30,37)(31,38)(32,39)(33,40)(34,36)(9,11,14,19)(10,15,12,17)(13,18,21,24)(16,22,20,23)(25,29)(26,28)(27,36)(30,39)(31,40)(32,37)(33,38)(34,35)(1,4,5,2)(3,7,8,6)(9,12,14,10)(11,17,19,15)(13,20,21,16)(18,23,24,22)(25,28)(26,29)(27,37)(30,35)(31,38)(32,36)(33,40)(34,39)(9,13,14,21)(10,16,12,20)(11,18,19,24)(15,22,17,23)(25,30,31,27)(26,32,33,34)(28,37,38,35)(29,39,40,36)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.