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