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)(15,23)(16,26)(17,22)(18,20)(19,25)(21,27)(24,28)(1,2)(3,4)(5,6)(7,10)(8,12)(9,11)(14,20)(15,24)(21,26)(22,25) involution — undirected(2,4)(13,15,17,21,18,24,19,26)(14,16,25,28,20,27,22,23)(5,7,9,8)(6,10,11,12)(13,16,18,27)(14,21,20,26)(15,25,24,22)(17,28,19,23)(2,4)(5,8,9,7)(6,10,11,12)(13,17,18,19)(14,22,20,25)(15,21,24,26)(16,23,27,28)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.