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