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