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