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