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