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