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)(11,15)(12,17)(13,18)(14,16)(19,22)(20,24)(21,23)(25,26,31,28)(27,29,34,32)(30,33,38,36)(35,37,40,39)(1,2)(3,5)(4,6)(7,8)(9,11,14,12)(10,15,16,17)(13,19,21,20)(18,22,23,24)(25,27)(26,32)(28,29)(30,35)(31,34)(33,39)(36,37)(38,40)(10,16)(15,17)(18,23)(22,24)(27,34)(29,32)(35,40)(37,39) involution — undirected(9,12,14,11)(10,17,16,15)(13,19,21,20)(18,22,23,24)(25,28,31,26)(27,32,34,29)(30,33,38,36)(35,37,40,39)(1,3,4,7)(2,5,6,8)(9,13)(10,18)(11,19)(12,20)(14,21)(15,22)(16,23)(17,24)(25,29,31,32)(26,27,28,34)(30,37,38,39)(33,35,36,40)(9,10)(11,15)(12,17)(13,18)(14,16)(19,22)(20,24)(21,23)(25,30)(26,33)(27,35)(28,36)(29,37)(31,38)(32,39)(34,40) 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.