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