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