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