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