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