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