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