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)(15,22)(16,24)(17,21)(18,19)(20,26)(23,27)(25,28)(1,2)(3,4)(5,6)(7,10)(8,12)(9,11)(13,15,17,18)(14,19,21,22)(16,25,26,23)(20,28,24,27)(2,4)(14,19)(15,18)(20,27)(21,22)(23,25)(24,28) involution — undirected(5,7,9,8)(6,10,11,12)(13,16)(14,20)(15,23)(17,26)(18,25)(19,27)(21,24)(22,28)(2,4)(5,8,9,7)(6,10,11,12)(16,26)(20,24)(23,25)(27,28)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.