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