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