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