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