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