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