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