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