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