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