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