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