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