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