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