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