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)(27,35)(28,32)(29,33)(30,39)(31,34)(36,40)(37,38)(1,2)(3,7)(4,6)(5,8)(9,11,14,20)(10,15,17,18)(12,21,13,19)(16,24,22,23)(27,36)(28,38)(32,37)(35,40)(1,3)(2,5)(4,8)(6,7)(25,27,29,37,31,36,30,32)(26,28,39,40,34,38,33,35)(2,6)(3,8)(9,12,14,13)(10,16,17,22)(11,19,20,21)(15,23,18,24)(25,28,31,38)(26,32,34,37)(27,33,36,39)(29,40,30,35)(2,6)(5,7)(9,13,14,12)(10,16,17,22)(11,19,20,21)(15,24,18,23)(25,29,31,30)(26,33,34,39)(27,37,36,32)(28,35,38,40)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.