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