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