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