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