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