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