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