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