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