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