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