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