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