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