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)(13,14,18,23)(15,25,26,20)(16,21,27,28)(17,24,19,22)(2,3)(5,6)(7,11)(8,10)(9,12)(13,15)(14,20)(16,19)(17,27)(18,26)(21,24)(22,28)(23,25) involution — undirected(5,7,8,12)(6,9,10,11)(13,16,18,27)(14,20,23,25)(15,17,26,19)(21,24,28,22)(1,3,4,2)(7,12)(9,11)(13,16)(14,21)(15,17)(18,27)(19,26)(20,22)(23,28)(24,25)(6,10)(9,11)(13,17,18,19)(14,22,23,24)(15,16,26,27)(20,21,25,28)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.