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