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