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