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