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