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