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