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