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