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