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