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