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