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