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