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