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