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