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