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