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