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