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