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)(11,17)(12,16)(13,14)(15,19)(18,24)(20,22)(21,23)(25,26,30,29)(27,33,35,31)(28,32,36,37)(34,40,38,39)(2,6)(3,8)(10,14)(15,17)(16,20)(23,24)(25,27)(26,31)(28,34)(29,33)(30,35)(32,39)(36,38)(37,40) involution — undirected(1,3)(2,4)(5,8)(6,7)(10,14)(15,17)(16,20)(23,24)(28,36)(32,37)(34,38)(39,40) involution — undirected(1,3)(2,4)(5,8)(6,7)(9,10)(11,15)(12,20)(13,14)(16,22)(17,19)(18,24)(21,23)(25,28,30,36)(26,32,29,37)(27,34,35,38)(31,39,33,40)(1,4)(2,3)(5,7)(6,8)(9,11)(10,15)(12,21)(13,19)(14,17)(16,24)(18,22)(20,23)(25,29,30,26)(27,33,35,31)(28,37,36,32)(34,40,38,39)(9,12)(10,16)(11,18)(13,22)(14,20)(15,23)(17,24)(19,21)(25,27)(26,33)(28,38)(29,31)(30,35)(32,39)(34,36)(37,40) 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.