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