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)(11,21)(12,18)(13,15)(14,24)(16,20)(17,23)(19,22)(25,26,30,32)(27,33,35,29)(28,31,37,38)(34,39,40,36)(2,6)(3,8)(9,11,16,23)(10,17,20,21)(12,22,13,14)(15,19,18,24)(25,27,30,35)(26,29,32,33)(28,34,37,40)(31,36,38,39)(1,3)(2,4)(5,8)(6,7)(9,12,16,13)(10,18,20,15)(11,22,23,14)(17,24,21,19)(25,26)(27,29)(28,31)(30,32)(33,35)(34,36)(37,38)(39,40)(1,3)(2,4)(5,8)(6,7)(9,13,16,12)(10,18,20,15)(11,14,23,22)(17,24,21,19)(25,26)(27,33)(28,31)(29,35)(30,32)(34,39)(36,40)(37,38)(1,4)(2,3)(5,7)(6,8)(9,14)(10,19)(11,12)(13,23)(15,21)(16,22)(17,18)(20,24)(25,28,30,37)(26,31,32,38)(27,34,35,40)(29,36,33,39)(9,15,16,18)(10,13,20,12)(11,19,23,24)(14,21,22,17)(25,29,30,33)(26,27,32,35)(28,36,37,39)(31,34,38,40)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.