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