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