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