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