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