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