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