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