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