One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,6)(7,10)(8,12)(9,11)(13,14)(15,20)(16,22)(17,21)(18,23)(19,24)(25,39)(26,34)(27,35)(28,36)(29,38)(30,37)(31,40)(32,41)(33,43)(42,44) involution — undirected(2,4)(5,7,9,8)(6,10,11,12)(13,15,17,27)(14,20,21,35)(16,26,19,32)(18,25,30,43)(22,34,24,41)(23,39,37,33)(28,29,42,31)(36,38,44,40)(5,8,9,7)(6,10,11,12)(14,21)(15,25)(16,19)(18,31)(20,33)(23,38)(26,28)(27,43)(29,30)(32,42)(34,44)(35,39)(36,41)(37,40)(2,4)(13,16,17,19)(14,22,21,24)(15,26,27,32)(18,29,30,31)(20,34,35,41)(23,38,37,40)(25,42,43,28)(33,36,39,44)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.