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