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