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