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