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