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