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