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