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