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