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