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