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