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