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