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