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