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