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