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