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