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)(11,18,16,12)(13,17,22,23)(19,24,21,20)(2,3)(6,7)(10,15)(11,16)(17,23)(19,21)(25,26,30,31)(27,32,37,40)(28,33,38,36)(29,34,39,35)(1,3,5,2)(4,7,8,6)(10,15)(12,18)(17,23)(20,24)(26,31)(28,38)(32,40)(34,35)(1,4,5,8)(2,6,3,7)(9,11,14,16)(10,12,15,18)(13,21,22,19)(17,24,23,20)(25,27)(26,32)(28,35)(29,33)(30,37)(31,40)(34,38)(36,39)(9,12)(10,16)(11,15)(13,20)(14,18)(17,21)(19,23)(22,24)(25,28)(26,33)(27,35)(29,32)(30,38)(31,36)(34,37)(39,40) involution — undirected(9,13)(10,17)(11,19)(12,20)(14,22)(15,23)(16,21)(18,24)(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.