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