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