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