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