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