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