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