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