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