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