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