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