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