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