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