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