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