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