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