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)(15,23)(16,26)(17,19)(21,25)(24,27)(1,2)(3,4)(5,6)(7,9)(8,10)(11,12)(13,14,18,20)(15,24,21,16)(17,28,19,22)(23,26,25,27)(2,4)(5,7,8,11)(6,9,10,12)(13,15,18,21)(14,16,20,24)(17,23,19,25)(22,26,28,27)(6,10)(9,12)(13,16)(14,21)(15,20)(17,27)(18,24)(19,26)(22,23)(25,28) involution — undirected(13,17,18,19)(14,22,20,28)(15,25,21,23)(16,27,24,26)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.