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