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