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)(11,14)(12,15)(13,17)(16,20)(18,22)(19,21)(23,24)(27,34)(28,35)(29,37)(31,38)(32,39)(36,40)(1,3,4,8)(2,5,6,7)(9,11)(10,14)(12,19)(13,18)(15,21)(16,23)(17,22)(20,24)(25,26)(27,31)(28,36)(29,32)(30,33)(34,38)(35,40)(37,39)(10,15)(12,20)(14,21)(16,17)(19,24)(22,23)(25,27,30,28)(26,31,33,36)(29,35,37,34)(32,40,39,38)(11,18)(14,22)(19,24)(21,23)(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.