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