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