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