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