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