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