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