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