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