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