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