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