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)(15,26)(16,30)(17,32)(18,24)(19,25)(20,23)(21,29)(22,27)(28,40)(31,43)(33,44)(34,39)(35,38)(36,42)(37,41) involution — undirected(5,7,10,6)(8,12,9,11)(13,15)(14,21)(16,20)(17,27)(18,31)(19,29)(22,23)(24,37)(25,26)(28,33)(30,32)(34,41)(35,42)(36,44)(38,40)(39,43)(2,4)(13,16,17,29,19,27,20,15)(14,22,32,26,25,30,23,21)(18,31,33,42,34,41,35,28)(24,37,44,40,39,43,38,36)(5,8,10,9)(6,11,7,12)(13,17,19,20)(14,23,25,32)(15,27,29,16)(18,33,34,35)(21,22,26,30)(24,38,39,44)(28,41,42,31)(36,37,40,43)(5,9,10,8)(6,11,7,12)(13,18,20,35,19,34,17,33)(14,24,23,38,25,39,32,44)(15,28,27,41,29,42,16,31)(21,36,30,43,26,40,22,37)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.