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