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