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