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