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