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