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