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