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