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