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