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