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