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