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