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