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