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