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