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