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