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