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