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