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