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