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