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