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