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