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