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