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