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