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