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