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