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