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