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