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