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