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