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