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