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