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