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