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