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