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