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