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