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