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