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