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