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