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