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