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