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