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