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