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