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