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