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