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