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