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