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