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