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