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