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