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