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