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