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