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)(25,26,32,37)(27,31,36,40)(28,35,30,33)(29,34,38,39)(1,2,5,6)(3,7,4,8)(9,11,15,23)(10,16,19,20)(12,21,24,18)(13,22,17,14)(25,27)(26,31)(28,29)(30,38)(32,36)(33,39)(34,35)(37,40)(9,12,15,24)(10,17,19,13)(11,21,23,18)(14,20,22,16)(25,28,32,30)(26,33,37,35)(27,38,36,29)(31,34,40,39)(1,3,5,4)(2,7,6,8)(9,12)(10,13)(11,21)(14,20)(15,24)(16,22)(17,19)(18,23)(25,29,32,38)(26,34,37,39)(27,28,36,30)(31,35,40,33)(9,13)(10,12)(11,22)(14,23)(15,17)(16,21)(18,20)(19,24)(25,30,32,28)(26,35,37,33)(27,38,36,29)(31,34,40,39)(1,4,5,3)(2,8,6,7)(9,14,15,22)(10,18,19,21)(11,13,23,17)(12,20,24,16)(25,31,32,40)(26,36,37,27)(28,34,30,39)(29,35,38,33)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.