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