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