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