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