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