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