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