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