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