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