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