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