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