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