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