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)(26,31)(27,29)(28,36)(39,40) involution — undirected(3,7)(6,8)(11,18)(15,16)(19,22)(20,24)(25,26)(27,32)(28,37)(29,34)(30,31)(33,36)(35,40)(38,39) involution — undirected(1,2)(3,6)(4,5)(7,8)(9,11)(10,15)(12,19)(13,20)(14,18)(16,17)(21,24)(22,23)(25,27,30,29)(26,32,31,34)(28,35,36,38)(33,39,37,40)(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)(26,33)(27,35)(29,38)(30,36)(31,37)(32,39)(34,40) involution — undirected(1,2)(3,6)(4,5)(7,8)(9,12)(10,13)(11,19)(14,23)(15,20)(16,24)(17,21)(18,22)(25,29,30,27)(26,34,31,32)(28,35,36,38)(33,39,37,40)(9,13)(10,12)(11,20)(14,21)(15,19)(16,22)(17,23)(18,24)(25,26)(27,32)(28,33)(29,34)(30,31)(35,39)(36,37)(38,40) 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.