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