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