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