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)(11,12)(13,21)(14,16)(15,17)(18,22)(19,23)(20,24)(1,3,6,5)(2,7,4,8)(9,11,14,17)(10,15,16,12)(13,19,22,24)(18,23,21,20)(25,26,30,31)(27,32,35,40)(28,33,38,37)(29,34,39,36)(1,3,6,5)(2,8,4,7)(10,16)(12,15)(13,22)(19,24)(26,31)(27,35)(28,38)(29,39)(9,12,14,15)(10,17,16,11)(13,20,22,23)(18,24,21,19)(25,27)(26,32)(28,34)(29,37)(30,35)(31,40)(33,39)(36,38)(1,4,6,2)(3,7,5,8)(9,10)(11,12)(13,18)(14,16)(15,17)(19,20)(21,22)(23,24)(25,28)(26,33)(27,36)(29,32)(30,38)(31,37)(34,35)(39,40)(1,5,6,3)(2,7,4,8)(9,13)(10,18)(11,19)(12,20)(14,22)(15,23)(16,21)(17,24)(25,29)(26,34)(27,37)(28,32)(30,39)(31,36)(33,35)(38,40)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.