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