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