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