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