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