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