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