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