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