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