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