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