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