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