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