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