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