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