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