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