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