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