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