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