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