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