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