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