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