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