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