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