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