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