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