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