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