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