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