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