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