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