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