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