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