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