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