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