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