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