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