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