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