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