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