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