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